New beautiful results on marine particle speciation, a challenge for the GEOTRACES community…

Advanced Light Source x-ray spectromicroscopy (XANES) allows a fine description of the marine Fe pool chemical speciation and mineralogy. This work describes diverse arrays of iron particles (20- 700 nm), showing impressive variations in the oxidation state and composition of these iron particles between the coasts of South Africa and Antarctica. Moreover, different iron pools are occurring in different frontal zones. Because particle speciation is directly linked to the element solubilities, these differences may affect the production of bioavailable dissolved iron.

Iron_particle_speciation

Source : Science (click on the image to view it larger)

 

Reference:

B. P. von der Heyden, A. N. Roychoudhury, T. N. Mtshali1, T. Tyliszczak, S. C. B. Myneni. (2012). Chemically and Geographically Distinct Solid-Phase Iron Pools in the Southern Ocean: Science 338 (6111): 1199-1201, DOI: 10.1126/science.1227504

Latest highlights

Science Highlights

Particulate Trace Element Export in the North Atlantic Ocean

Authors estimated particulate trace element export fluxes and residence times in the upper North Atlantic Ocean

12.11.2020

Science Highlights

Surface water trace element and isotope data challenge dust flux models

They reveal that atmospheric deposition and not the physical transport, is the most important process supplying Fe to phytoplankton in the South Pacific Gyre

05.11.2020

Science Highlights

Dissolved iron and manganese fates reveal processes along the hydrothermal TAG plume

Authors performed high-spatial resolution analyses of dissolved iron and manganese samples collected at the Mid Atlantic Ridge

20.10.2020

Science Highlights

The power of combining geochemical tracer data with direct current measurements

Learn about new discoveries done combining seawater Rare Earth Elements concentrations and direct physical oceanographic observations

14.10.2020

Rechercher